Diaphragm



FIG. 1 is a bottom perspective view of a diaphragm showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a sectional view taken on line 3--3 of FIG. 2; and

FIG. 4 is a side elevational view thereof.

The top is plain and unornamented. 

The ornamental design for a diaphragm, as shown and described. 